Abstract: A new fast motion estimation algorithm，Direction Based Diamond-T Search（DBDTS），is proposed based on analyzing the integer motion estimation algorithm in JM11.0 of H.264.The algorithm efficiently reduces the time of motion estimation with minimal loss in bitrate and reconstructed quality.Then，it is tested by typical video sequences and comparisons with FS，EPZS and UMHexagonS are made.Experimental results show that the improved algorithm reduces the time of motion estimation efficiently while keeping similar visual quality.

摘要： 通过对H.264参考模型JM11.0中整像素运动估计算法的分析，提出了一种新的快速运动估计搜索算法：基于方向预测的菱形-T形搜索算法（Direction Based Diamond-T Search，DBDTS）。改进算法在保证视频序列各分量信噪比和输出比特率的同时有效地减少了运动估计时间。分别应用FS、EPZS、UMHexagonS和改进算法对典型序列进行测试。测试结果表明，新算法在保证编码性能的同时，有效地提高了运动估计速度。